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wat is d difference between stereospecific and stereoselective type of rxns????please give an example also..

5 years ago


Answers : (1)


Dear unnati

Stereospecific Reaction: One in which one or more reactants or catalysts cause a reaction to take place at specific conformational sites, thus leading to a preferred spatial geometry of the reaction product. Syndiotactic polymers are a result of stereospecific polymerization

For example, the addition of dibromocarbene to cis-2-butene yields cis-2,3-dimethyl-1,1-dibromocyclopropane whereas addition of dibromocarbene to the trans isomer exclusively yields the trans cyclopropane.

stereospecific carbene reaction

Stereoselective Reaction:stereoselectivity is the property of a chemical reaction in which a single reactant forms an unequal mixture of stereoisomers during the non-stereospecific creation of a new stereocenter or during the non-stereospecific transformation of a pre-existing one

An example of modest stereoselectivity is the dehydrohalogenationof 2-iodo-butane which yields 60% trans-2-butene and 20% cis-2-butene. Since alkene geometric isomers are also classified as diastereomers, this reaction would also be called diastereoselective.

Stereoselective dehalogenation

All the best


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5 years ago

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